"Purity is a requirement of love. It is the dimension of the inner truth of love in man’s 'heart.'" Source: Pope St. John Paul II, Man and Woman He Created Them, Pauline Books and Media, 2006.
"When we are before the Blessed Sacrament, instead of looking about us, let us close our eyes and open our hearts. The good God will open His. We will go to Him. He will come to us, the one to give, the other to receive." Source: St. John Vianney, The Meditations of the Curé [...]
"If a word, we are like the Paphlagonian partridge, which has two hearts; for we have a very tender, pitiful, easy heart toward ourselves, and one which is hard, harsh, and strict toward our neighbor. We have two scales, one wherein to measure our own goods to the best advantage, and the other to weigh [...]